Starter

Abstract

To prevent an attracting force to the plunger from becoming insufficient, at least one of an output shaft and a thrust spline is formed from magnetic material having a lower relative permeability than iron.

What is claimed is:  
     
       1. A starter comprising: 
       an output shaft driven by an electric motor; and  
       a plunger, an exciting coil, and an over-running clutch coaxially arranged on the output shaft,  
       wherein the plunger is attracted by exciting the exciting coil to drive the motor, and the over-running clutch with a thrust spline spline-connected to the output shaft is moved toward a ring gear to allow a pinion of the over-running clutch to mesh with the ring gear for starting an engine,  
       wherein at least one of the output shaft and the thrust spline is formed from magnetic material that has a lower relative permeability than the periodic element iron, and  
       wherein at least one of the output shaft and the thrust spline is formed from work-hardened austenitic stainless steel material.